Question 1

The minimum amount of energy released in an electron-positron annihilation is

Accepted Answer

A) 0 
B) 0.511 MeV 
C) 1.022 MeV 
D) 2.044 MeV 
E) None of these is correct. 
A) 0 
B) 0.511 MeV 
C) 1.022 MeV 
D) 2.044 MeV 
E) None of these is correct. C

Question 2

Use the figure to the right for the next problem. A flexible rope of mass m and length L = LS1U1B11S1U1B0 + LS1U1B12S1U1B0, hangs over a frictionless peg, as shown in the  
-What is the speed of the rope when it just slides off the peg?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)    B

Question 3

A 5-kg box is pushed 5 m up a plane that is inclined at 30º with the horizontal.The coefficient of kinetic friction between the box and the plane is 0.20.The change in potential energy of the box is approximately

Accepted Answer

A) 12.5 J 
B) 34.2 J 
C) 123 J 
D) 345 J 
E) 403 J 
A) 12.5 J 
B) 34.2 J 
C) 123 J 
D) 345 J 
E) 403 J C

Question 4

Susana ascends a mountain via a short,steep trail.Sean ascends the same mountain via a long,gentle trail.Which of the following statements is true?

Accepted Answer

A) Susana gains more gravitational potential energy than Sean. 
B) Susana gains less gravitational potential energy than Sean. 
C) Susana gains the same gravitational potential energy as Sean. 
D) To compare energies,we must know the height of the mountain. 
E) To compare energies,we must know the lengths of the two trails. 
A) Susana gains more gravitational potential energy than Sean. 
B) Susana gains less gravitational potential energy than Sean. 
C) Susana gains the same gravitational potential energy as Sean. 
D) To compare energies,we must know the height of the mountain. 
E) To compare energies,we must know the lengths of the two trails.

Question 5

Assuming the incline to be frictionless and the zero of gravitational potential energy to be at the elevation of the horizontal line,

Accepted Answer

A) the kinetic energy of the block just before it collides with the spring will be equal to mgh. 
B) the kinetic energy of the block when it has fully compressed the spring will be equal to mgh. 
C) the kinetic energy of the block when it has fully compressed the spring will be zero. 
D) the kinetic energy of the block just before it collides with the spring will be   kx2. 
E) None of the above statements will be true. 
A) the kinetic energy of the block just before it collides with the spring will be equal to mgh. 
B) the kinetic energy of the block when it has fully compressed the spring will be equal to mgh. 
C) the kinetic energy of the block when it has fully compressed the spring will be zero. 
D) the kinetic energy of the block just before it collides with the spring will be   kx2. 
E) None of the above statements will be true.

Question 6

If you drive at the posted speed limit of 70 mph on the interstate,what is the fraction of your speed compared to the speed of light?

Accepted Answer

A) 6.48 $\times$ 10  -8 
B) 1.04 $\times$ 10  -7 
C) 2.33 $\times$ 10  -7 
D) 3.73 $\times$ 10  -7 
E) None of these is correct. 
A) 6.48 $\times$ 10  -8 
B) 1.04 $\times$ 10  -7 
C) 2.33 $\times$ 10  -7 
D) 3.73 $\times$ 10  -7 
E) None of these is correct.

Question 7

The potential energy function for a conservative force acting in the x direction is shown in the figure on the right.Where would the particle experience a force directed to the right?

Accepted Answer

A) between A & B and E & F 
B) between B & C and C & D 
C) between B & C and D & E 
D) at points B and D 
E) at points C and E 
A) between A & B and E & F 
B) between B & C and C & D 
C) between B & C and D & E 
D) at points B and D 
E) at points C and E

Question 8

When a hydrogen atom absorbs a photon with E = 4.089 $\times$ 10     19 J,what is the frequency of the photon?

Accepted Answer

A) 6.17 $\times$ 1014 Hz 
B) 2.45 $\times$1018 Hz 
C) 2.55 $\times$ 108 Hz 
D) 6.623 $\times$ 1034 Hz 
E) None of these is correct. 
A) 6.17 $\times$ 1014 Hz 
B) 2.45 $\times$1018 Hz 
C) 2.55 $\times$ 108 Hz 
D) 6.623 $\times$ 1034 Hz 
E) None of these is correct.

Question 9

According to the mass-energy relationship,how much energy is released if 1 kg of matter were converted to energy?

Accepted Answer

A) 1 J 
B) 9 J 
C) 3 $\times$ 108 J 
D) 3 $\times$ 1016 J 
E) 9 $\times$ 1016 J 
A) 1 J 
B) 9 J 
C) 3 $\times$ 108 J 
D) 3 $\times$ 1016 J 
E) 9 $\times$ 1016 J

Question 10

A mass m is released from a height 60 cm from the right-hand side of the track shown in the diagram at right.There is only friction acting on the mass on the horizontal portion 35 cm either side of the midpoint O,with a kinetic coefficient of friction of $\mu$k = 0.5.Determine what is the velocity of the block the first time it passes through the midpoint,and on which side of the midpoint does it stop?

Accepted Answer

A) 3.4 m/s,R 
B) 3.9 m/s,R 
C) 3.9 m/s,L 
D) 2.9 m/s,L 
E) 2.9 m/s,R 
A) 3.4 m/s,R 
B) 3.9 m/s,R 
C) 3.9 m/s,L 
D) 2.9 m/s,L 
E) 2.9 m/s,R

Question 11

A block with a mass M = 4.85 kg is resting on a slide that has a curved surface.There is no friction.The speed of the block after it has slid along the slide sufficiently far for its vertical drop to be 19.6 m is

Accepted Answer

A) 19.6 m/s 
B) 384 m/s 
C) 73 m/s 
D) 43.2 m/s 
E) The problem cannot be solved because the shape of the curved slide is not given. 
A) 19.6 m/s 
B) 384 m/s 
C) 73 m/s 
D) 43.2 m/s 
E) The problem cannot be solved because the shape of the curved slide is not given.

Question 12

An electron has a rest mass of 0.511 MeV.From this information one can conclude that the rest mass of an electron is

Accepted Answer

A) 9.08 $\times$ 10  -31 kg 
B) 8.82 $\times$ 10 -14 kg 
C) 2.94 $\times$ -22 kg 
D) 5.68 $\times$ 10  -12 kg 
E) None of these is correct. 
A) 9.08 $\times$ 10  -31 kg 
B) 8.82 $\times$ 10 -14 kg 
C) 2.94 $\times$ -22 kg 
D) 5.68 $\times$ 10  -12 kg 
E) None of these is correct.

Question 13

Which of the following statements is NOT correct?

Accepted Answer

A) The work done by a conservative force on an object is independent on the path taken. 
B) The work done by a conservative force on an object along path A$\to$B is negative that of path B$\to$A. 
C) The force due to gravity is an example of a conservative force. 
D) Friction is an example of a conservative force. 
E) The work done by friction on an object depends on the path taken. 
A) The work done by a conservative force on an object is independent on the path taken. 
B) The work done by a conservative force on an object along path A$\to$B is negative that of path B$\to$A. 
C) The force due to gravity is an example of a conservative force. 
D) Friction is an example of a conservative force. 
E) The work done by friction on an object depends on the path taken.

Question 14

Which potential energy versus displacement curve best represents that of an extended spring?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 15

Two unequal masses hang from either end of a massless cord that passes over a frictionless pulley.Which of the following is true about the gravitational potential energy (U)and the kinetic energy of the system (K)after the masses are released from rest?

Accepted Answer

A) $\Delta$U 0 B) $\Delta$U = 0 and $\Delta$K > 0 C) $\Delta$U 0 and $\Delta$K < 0 A) $\Delta$U 0 B) $\Delta$U = 0 and $\Delta$K > 0 C) $\Delta$U 0 and $\Delta$K < 0

Question 16

The work done by a conservative force between two points is

Accepted Answer

A) always positive. 
B) always dependent upon the time. 
C) always independent of the path. 
D) zero. 
E) never completely recoverable. 
A) always positive. 
B) always dependent upon the time. 
C) always independent of the path. 
D) zero. 
E) never completely recoverable.

Question 17

According to Quantum Chromodynamics,the force that keeps quarks confined within a proton (or neutron)increases as the separation between the individual quarks increases.Which statement below best represents this scenario?

Accepted Answer

A) The quarks are tied together by nonstretchable strings. 
B) The quarks are tied together by elastic strings. 
C) The quarks move independently of each other. 
D) The force between the quarks has a 1/r2 behavior like gravity. 
E) The potential energy of a quark decreases with separation. 
A) The quarks are tied together by nonstretchable strings. 
B) The quarks are tied together by elastic strings. 
C) The quarks move independently of each other. 
D) The force between the quarks has a 1/r2 behavior like gravity. 
E) The potential energy of a quark decreases with separation.

Question 18

A block of mass,m,is pushed up against a spring,compressing it a distance x,and is then released.The spring projects the block along a frictionless horizontal surface,giving the block a speed v.The same spring projects a second block of mass 4m,giving it a speed 3v.What distance was the spring compressed in the second case?

Accepted Answer

A) x 
B) 2x 
C) 3x 
D) 4x 
E) 6x 
A) x 
B) 2x 
C) 3x 
D) 4x 
E) 6x

Question 19

A 4.0-kg block starts from rest and slides 5.0 m down a plane inclined at 60º to the horizontal.The coefficient of kinetic friction between the surface and the block is 0.20.The work done by friction on the block is

Accepted Answer

A) 98.0 J 
B) 19.6 J 
C) 3.92 J 
D) 3.40 J 
E) 64.0 J 
A) 98.0 J 
B) 19.6 J 
C) 3.92 J 
D) 3.40 J 
E) 64.0 J

Question 20

Use the figure to the right for the next problem. A flexible rope of mass m and length L = LS1U1B11S1U1B0 + LS1U1B12S1U1B0, hangs over a frictionless peg, as shown in the  
-What is the change in potential energy when the end of the rope just slides off the peg?

Accepted Answer

A)    mgL 
B)    mgL1 
C)    mgL2 
D)    mgL12/(L) 
E)    mgL1L2/(L) 
A)    mgL 
B)    mgL1 
C)    mgL2 
D)    mgL12/(L) 
E)    mgL1L2/(L)

Exam 7: Conservation of Energy

The minimum amount of energy released in an electron-positron annihilation is

Use the figure to the right for the next problem. A flexible rope of mass m and length L = L1 + L2, hangs over a frictionless peg, as shown in the figure -What is the speed of the rope when it just slides off the peg?

A 5-kg box is pushed 5 m up a plane that is inclined at 30º with the horizontal.The coefficient of kinetic friction between the box and the plane is 0.20.The change in potential energy of the box is approximately

Susana ascends a mountain via a short,steep trail.Sean ascends the same mountain via a long,gentle trail.Which of the following statements is true?

Assuming the incline to be frictionless and the zero of gravitational potential energy to be at the elevation of the horizontal line,

If you drive at the posted speed limit of 70 mph on the interstate,what is the fraction of your speed compared to the speed of light?

The potential energy function for a conservative force acting in the x direction is shown in the figure on the right.Where would the particle experience a force directed to the right?

When a hydrogen atom absorbs a photon with E = 4.089 ×\times× 10 19 J,what is the frequency of the photon?

According to the mass-energy relationship,how much energy is released if 1 kg of matter were converted to energy?

A block with a mass M = 4.85 kg is resting on a slide that has a curved surface.There is no friction.The speed of the block after it has slid along the slide sufficiently far for its vertical drop to be 19.6 m is

An electron has a rest mass of 0.511 MeV.From this information one can conclude that the rest mass of an electron is

Which of the following statements is NOT correct?

Which potential energy versus displacement curve best represents that of an extended spring?

Two unequal masses hang from either end of a massless cord that passes over a frictionless pulley.Which of the following is true about the gravitational potential energy (U)and the kinetic energy of the system (K)after the masses are released from rest?

The work done by a conservative force between two points is

According to Quantum Chromodynamics,the force that keeps quarks confined within a proton (or neutron)increases as the separation between the individual quarks increases.Which statement below best represents this scenario?

A 4.0-kg block starts from rest and slides 5.0 m down a plane inclined at 60º to the horizontal.The coefficient of kinetic friction between the surface and the block is 0.20.The work done by friction on the block is

Use the figure to the right for the next problem. A flexible rope of mass m and length L = L1 + L2, hangs over a frictionless peg, as shown in the figure -What is the change in potential energy when the end of the rope just slides off the peg?

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Newtons Laws

Applications of Newtons Laws

Work and Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Conservation of Angular Momentum

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Wave Motion

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

The Electric Field I: Discrete Charge Distributions

The Electric Field Ii: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Elementary Particles and the Beginning of the Universe

Filters

Use the figure to the right for the next problem. A flexible rope of mass m and length L = L₁ + L₂, hangs over a frictionless peg, as shown in the figure -What is the speed of the rope when it just slides off the peg?

When a hydrogen atom absorbs a photon with E = 4.089 $\times$ 10 $When a hydrogen atom absorbs a photon with E = 4.089 \times 10 <sup> </sup> <sup>19</sup> J,what is the frequency of the photon?$ ¹⁹ J,what is the frequency of the photon?

Use the figure to the right for the next problem. A flexible rope of mass m and length L = L₁ + L₂, hangs over a frictionless peg, as shown in the figure -What is the change in potential energy when the end of the rope just slides off the peg?